Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:09:42 2012 Optimize a model with 8834 rows, 3306 columns and 29524 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.21s Presolved: 8832 rows, 3304 columns, 29214 nonzeros Variable types: 0 continuous, 3304 integer (3304 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 2.000000e+00, 2533 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 114 55.00000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 149 4.00000 2.66667 33.3% - 1s 0 0 2.67073 0 2903 4.00000 2.67073 33.2% - 1s 0 0 2.67073 0 2879 4.00000 2.67073 33.2% - 2s 0 0 2.67073 0 2876 4.00000 2.67073 33.2% - 2s 0 0 2.67073 0 2863 4.00000 2.67073 33.2% - 3s 0 0 2.67073 0 2879 4.00000 2.67073 33.2% - 4s 0 0 2.67073 0 2656 4.00000 2.67073 33.2% - 5s 0 0 2.67073 0 2459 4.00000 2.67073 33.2% - 6s 0 0 2.67073 0 2515 4.00000 2.67073 33.2% - 7s 0 0 2.67073 0 2509 4.00000 2.67073 33.2% - 8s 0 0 2.67073 0 2511 4.00000 2.67073 33.2% - 9s 0 0 2.67073 0 2531 4.00000 2.67073 33.2% - 10s 0 0 2.67073 0 2559 4.00000 2.67073 33.2% - 10s 0 0 2.67073 0 2461 4.00000 2.67073 33.2% - 11s 0 2 2.80000 0 2461 4.00000 2.80000 30.0% - 13s Cutting planes: Clique: 60 Zero half: 2 Explored 13 nodes (41020 simplex iterations) in 13.92 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%